Top burner construction for gas stoves



May 15, 1956 A. H. CRONE 29745948E TOP BURNER CONSTRUCTION FOR GAS STOVES Filed Oct. 3, 1951 2 Sheets-Sheet l Mali M 2 sheet 2 jfiyg f MW; g am E N O R C H A TOP BURNER CONSTRUCTION FOR GAS STOVES n. )l I United States Patent TOP BURNER CONSTRUCTION Fon GAS srovus Albert H. Crone, Rockford, Ill., assignor to Geo. D. Roper Corporation, Rockford, 111., a corporation of Illinois Application October 3, 1951, Serial No. 249,529

4 Claims. (Cl. 158-115) This invention relates to a top burner and flash tube assembly for gas stoves.

It is an object of this invention to provide a novel assembly of top burners, pilot burner and flash tubes on a gas stove in which the flash tube is located in a positive manner in communication with the top burner charging ports to insure ignition of the top burners from the pilot burner.

Another object of this invention is to form a one-way mixer for a top burner and the lower half of the flash tube as an integral casting, so as to insure a fixed relation between the flash tube and a charging port formed in the mixer for the top burner.

It is also an object of this invention to provide a novel flash tube construction in which a heat dissipator for the pilot burner is cast integral with the upper half of the flash tube.

Other and further objects and advantages of the invention will be apparent from the following description of a preferred form of the invention, illustrated in the accompanying drawings.

In the drawings:

Figure 1 is a top view of the assembly of front and rear top burners, pilot burner, and flash tubes, according to the present invention;

Figure 2 is a side view of the assembly of Fig. 1;

Figure 3 is a section along the line 33 in Fig. 1;

Figure 4 is a section along the line 4-4 in Fig. 1;

Figure 5 is a top view of the front top burner on the stove;

Figure 6 is a top view of the simmer bolt associated with either of the top burners;

Figure 7 is a front view of the simmer bolt;

Figure 8 is a side view, partly in section, of the front burner of Fig. 5 with the simmer bolt assembled thereon to hold the burner head and mixer in assembled relation;

Figure 9 is a top view of the integral casting of the mixer for the rear burner and the lower half of the flash tube assembly, according to the present invention;

Figure 10 is a section along the line 1010 in Fig. 9, showing the bottom half of the rear burner;

Figure 11 is a side view of the Fig. 9 construction, with the burner head and simmer bolt assembled thereon and shown in section;

Figure 12 is a section along the line 1212 in Fig. 9;

Figure 13 is a section along the line 13-13 in Fig. 9;

Figure 14 is a section along the line 14-14 in Fig. 9.

Referring to the drawings, the assembly shown in Figs. 1 and 2 includes a front top burner 20, which receives a combustible air-gas mixture from a mixer 21 having a bell-shaped inlet 22 at which air and gas are received, to intermingle in their passage through the mixer 21 to the flame ports 23 at the front burner.

As best seen in Figs. 5 and 8, the front burner is formed with separable upper and lower sections 24 and 25. The lower burner section 24 is cast integral with the mixer 21 and is formed with an annular passage 26 at its upper side which communicates with the 2,745,481 Patented May 15, 1956 fuel passage 27 in the mixer to receive the combustible air-gas mixture therefrom. A locating lug 28 protrudes horizontally outward from the lower section of the front burner for locating the front burner with respect to the flash tube, as will appear hereinafter. An upwardly extending series of ports 29 is formed in the lower section of the front burner to extend from an ignition or charging port, positioned to register with the open end of the flash tube when the parts are assembled. In this manner, the charging port on the front burner receives ignition through the flash tube from the pilot burner and the ignition flame travels upward along ports 29 to light the flame ports 23 on the front burner.

The upper section 25 of the front burner is formed with an annular fuel passage 30 at its underside which registers with the fuel passage 26 in the upper side of the lower burner section. The flame ports 23 extend outward and upward at a slight angle through the peripheral side wall of the upper burner section and communicate with the burner fuel passage 30, 26 to discharge the air-gas mixture therefrom. The upper burner section 25 is formed with a peripheral depending lip 31 which rests against an annular upwardly-facing shoulder 32 formed at the periphery of the lower burner section 24. An asbestos gasket 33 is interposed between the assembled sections 24, 25 of the front burner and is surrounded by the lip 31, so as to be protected thereby from possible spillovers from the cooking vessel heated by the front burner. The lower burner section is formed at its periphery with an upstanding lug 62 snugly seated in a corresponding complemenatry recess in the upper burner section to secure proper radial alignment of the burner sections.

Both the upper and lower sections of the front burner include abutting, recessed, radially inwardly-extending arms, here shown as three in number, which form radial fuel passages 34. These radial fuel passages terminate in an inner annular fuel passage 35 at the center of the assembly of the upper and lower sections of the front burner. For controlling the escape of fuel from this central passage 35 there is provided a burner bolt 36 (Fig. 7), which has a generally frusto-conical head 37 adapted to seat against a frustoconical seat formed on the upper face of the upper section 25 of the front burner. As best seen in Figs. 7 and 8, the burner bolt is threaded at its lower end and is threadedly received in a vertical recess 36a formed in the upper side of the lower burner section 24. Above the annular passage 35, the upper burner section 25 is formed with a cylindrical stem portion 39 on the burner bolt, so that the air-gas mixture rises upward through the passage 38 around the stem portion 39. A plurality of spaced, inclined, protruding, radial ribs 40 are formed on the frusto-conical lower seating surface 41 on the burner bolt head 37. These ribs define separate passages for the escape of fuel from the passage 38. Suitable means may be formed on the upper face of the bolt head 37 to facilitate the initial assembly of the burner bolt by a screw driver or the like. The threaded position of the burner bolt determines the size of the passages between the ribs 40, and thus the size of the flames issuing thereat. Thus, the burner bolt, in cooperation with the frusto-conical seating surface on the upper face of the upper burner section, defines a small central burner for preventing a cold spot at the center of the cooking vessel. Also, the burner bolt is the sole means locking the upper and lower sections of the front burner in assembled relation. Preferably the burner bolt is cold forged or die cast in a one piece construction.

As best seen in Figs. 9 and 11, the mixer for the rear burner, the lower section of the rear burner, and the lowor section of the flash tube assembly are formed as an integral casting. The mixer for the rear burner includes an elongated tube 42 having a bell-mouthed inlet 43 for receiving gas and air. The Venturi-shaped passageway 44 which extends along the length of the mixer communicates with an annular passage 45 formed in the upper side of the lower section 46 of the rear top burner. The burner head 47, which forms the upper section of the rear burner, is formed separately and is assembled on the lower section in a manner identical with the described assembly of the front burner, including the burner bolt.

A horizontal arm 48 extends transversely outward from the mixer 42 midway along the length thereof. The arm 48 supports one end of a channel-shaped lower flash tube section 49, which extends substantially horizontal, at a level above the mixer 42 (see Fig. 11). At its other end the flash tube section 49 terminates at a channel-shaped annulus 50, which extends around the pilot burner 63 (Fig. 3) in the assembled position.

Another channel-shaped lower flash tube member 51 extends from the annulus 50, at the side thereof remote from its connection to the flash tube section 49, and is joined at its other end to the lower end of the lower rear burner section 46. At this latter end, the flash tube section 51 is open and is positioned in alignment with the charging port 52 for the rear burner.

A supporting arm 53 extends transversely outward from the mixer 42 to support the annulus therefrom.

At its outer end the arm 48 is formed with an upstanding lug 54, which is adapted to be received in a hole 55 formed in the protruding lug 28 attached to the front burner. An upraised flat portion 56 is formed on the upper side of the mixer 42 and forms a seat for a depending lug 57 at the underside of the front burner having a flat bottom surface for seating on the flat portion 56. In the assembled position of these parts, the front burner rests at 57 on the flat portion 56 formed on the mixer 42 and the arm 28 which protrudes from the front burner rests on top of the arm 48, which is cast integral with the mixer 42, with the upstanding lug 54 extending into the hole 55 formed in the burner arm 28. In this manner, the front burner is physically supported by the rear mixer, and the charging port for the front burner is positively located in alignment with the adjacent open end of the flash tube section 49.

Obviously, the charging port 52 for the rear burner bears a fixed relation to the adjacent end of the flash tube section 51 because the rear burner and this flash tube section are formed as an integral cast construction.

Figs. 1 and 2 best illustrate the construction of the integral member which forms the upper sections for the flash tubes and provides a heat dissipator for the pilot burner. A first channel-shaped arm 58 is formed with a substantially semicircular groove lengthwise along its underside. At the opposite side of the heat dissipating shield 59 the other channel-shaped arm 60 is similarly substantially semi-circular in cross-section to provide a groove extending lengthwise along its underside. Each of these arms is formed with outwardly offset depending flanges 58a and 60a at each side adapted to overlap snugly the corresponding upstanding sides of the lower channel sections 49 and 51, to form unitary flash tube assemblies therewith.

The heat dissipating hood 59 is elongated transversely of the flash tube assemblies and is arcuate in configuration. A plurality of upstanding ribs 61, which extend lengthwise of the hood 59, enhance its heat-dissipating function for preventing the formation of a hot spot on the stove top directly above the pilot burner.

While the foregoing discussion and the accompanying drawings relate to a specific preferred embodiment of the present invention, it is to be understood that modifications in and changes from the illustrated embodiment of the invention may be resorted to without departing from the spirit and scope of my invention,

I claim:

1. A top burner and flash tube construction comprising an elongated mixer tube, a lower portion of a rear burner cast integrally with one end of said mixer tube and formed with an ignition port, a front burner supported on said mixer tube intermediate the ends thereof in fixed relation thereto and formed with an ignition port, a lower flash tube member including a pair of channel-shaped horizontal lower flash tube arms each having one end thereof cast integral with said mixer tube, a first of said flash tube arms having said one end thereof positioned adjacent the rear burner ignition port to communicate therewith, the other of said flash tube arms having said one end thereof positioned adjacent said front burner ignition port to communicate therewith, said flash tube arms extending laterally of said mixer tube towards each other and having the adjacent ends thereof spaced horizontally from one side of said mixer tube, a pilot burner support ring cast integrally with the other ends of said flash tube arms and disposed closely adjacent said mixer tube at said one side thereof, an upper flash tube member including a pair of downwardly opening channel-shaped arms disposed on the arms of said lower member, and a downwardly opening imperforate channel-shaped heat shield cast integrally with the arms of said upper member and extending transversely thereof.

2. The combination of claim 1 including a support bracket cast integrally with said mixer tube and said pilot burner support ring and extending transversely of said mixer tube. I

3. A top burner and flash tube construction comprising a straight elongated rear mixer tube having an upwardly extending portion on the rear end thereof, a rear burner on said upwardly extending end of said mixer tube and spaced above the rear mixer tube, a lower flash tube member comprising a pilot burner locator ring having first and second elongated arms cast integrally therewith and extending in opposite directions therefrom, the end of said first arm remote from said ring being cast integrally with said upwardly extending portion of said rear mixer tube to extend forwardly therefrom along one side of said rear mixer tube, a support bracket cast integrally with said rear mixer tube and extending horizontally outwardly from said rear mixer tube intermediate the ends of the latter, said bracket being cast integrally with one end of said second arm remote from said ring to support said flash tube member at said one side of said rear mixer tube with the support ring horizontally offset from the rear mixer tube and located closely adjacent thereto, a front burner mixer tube curved to overlie the rear mixer tube intermediate the ends of the latter, a front burner on said front mixer tube overlying said rear mixer tube, means on said rear mixer tube for supporting the front mixer tube thereon, locator means on said support bracket for locating the front burner mixer tube in fixed relation to said one end of said second arm, an upper flash tube member including a pair of downwardly opening channel-shaped arms disposed on the arms of said lower member, a downwardly opening channelshaped heat shield cast integrally with the arms of said upper member and extending transversely thereof to maintain the arms of the upper member in fixed relation to each other, said front and rear mixer tubes having gas discharge ports therein directed into the ends of the flash tubes defined by the arms of the upper and lower flash tube members, said upper flash tube member being disposed below the plane of the tops of said forward and rear burners when mounted on said lower flash tube member.

4. A top burner and flash tube construction comprising a straight elongated rear mixer tube having an upwardly extending portion on one end thereof, a lower portion of a rear burner cast integrally with said one end of said mixer tube and spaced above the mixer tube, a lower flash tube member and pilot burner locator comprising a cast pilot burner locator ring having first and second elongated arms cast integrally therewith and extending in opposite directions therefrom, the end of said first arm remote from said ring being cast integrally with said upwardly extending portion of said rear mixer tube to extend forwardly therefrom along one side of said rear mixer tube, a support bracket cast integrally with said rear mixer tube and extending horizontally outwardly from said rear mixer tube intermediate the ends thereof, said bracket being cast integrally with the end of said second arm remote from said ring to support said flash tube member and pilot burner locator on said rear mixer tube with the support ring horizontally oifset from the rear mixer tube and located closely adjacent thereto, a front burner mixer tube curved to overlie the rear mixer tube intermediate the ends of the latter and having the lower portion of a front burner cast integrally therewith, means on said rear mixer tube for supporting the front mixer tube thereon, locator means on said support bracket engageable with said front mixer tube for locating the front burner mixer tube with respect to the end of said second arm remote from said ring, an upper flash tube member including a pair of downwardly opening channelshaped arms disposed on the arms of said lower flash tube member, a downwardly opening channel-shaped heat shield cast integrally with the arms of said upper member and extending transversely thereof, said heat shield projecting above the arms of said upper member to form a pilot burner combustion chamber, and upper burner members mounted on each of said front and rear lower burner portions and disposed above said heat shield, said forward and rear flash tubes having gas discharge ports therein directed into the ends of the flash tubes defined by the arms on the upper and lower flash tube members.

References Cited in the file of this patent UNITED STATES PATENTS 551,715 Brooke Dec. 17, 1895 1,879,992 Rogers Sept. 22, 1932 1,928,500 ODowd Sept. 26, 1933 2,032,877 Harper Mar. 3, 1936 2,049,650 Hobson Aug. 4, 1936 2,054,250 Harper Sept. 15, 1936 2,497,787 Minster Feb. 14, 1950 2,537,692 Mueller Jan. 9, 1951 

